Polished Cold Mountain Thunderegg Cut Chunk Lapidary Stone Marra Mamba Some defects can be present

Some defects can be present

and old grit buildup

and will cut nice solid cabable slabs

The skin of this stone has a natural polish due to microscopic diamonds in the creek it was collected

but the most accepted theory is that they are coprolites and intestinal casts from Predatory Sea Worms

Polished Cold Mountain Thunderegg Cut Chunk Lapidary Stone Marra Mamba Some defects can be presentThis one has been cut and has a nice polish on one side. Cold Mountain Thundereggs are a really neat form of rhyolite and agate filled thundereggs from Mexico. These often look ugly and unappealing from the outside, but are jaw dropping gorgeous once cut! Unless it is showing a good window, I don't personally recommend buying these in the rough unless you have a saw. But, once these have been cut, its very easy to see why they are so popular among